Needle flame
testing machine is with specified size (Φ0.9mm) needle burner with a specific gas (butane) to 45°The sample is ignited in a fixed direction at an angle, and whether the sample is ignited, the holding time and the burning length are observed to evaluate the fire hazard of the small flame caused by the fault condition of the equipment. Main parameters: 01. Burner angle: vertical (when adjusting and measuring flame height) or inclined 45°(during the test); 02. Combustion gas: 95% butane gas or propane gas; 03. Ignition bedding layer: white pine board (thickness 10mm), the surface is covered with a layer of 12~30g/m2 standard silk paper, away from the place where the flame is applied down 200mm±5mm; 04. Temperature range: 0--1000℃; 05. Flame temperature requirements: from 100±2℃～700℃±3°C, should be at 23.5±Completed within 1.0s; 06. Flame height: 12mm±1mm, height measuring device; 07. Burning time: adjustable from 0s to 999.9s, generally set to 30s; 08. Holding time: 0s～999.9s, automatic recording, manual pause; 09. Test space:≥0.5m3, black background, (0.75m3 cubic or 1m3 can be customized according to customer requirements). Test preparation: 1. Place the test sample, white pine board and silk paper in an atmospheric environment with a temperature of 15℃-35℃ and a relative humidity of 45%-75% for 24h. 2. Check whether the equipment and instruments meet the test requirements of this project. 3. Before the test, prepare sample information (material composition, sample structure diagram, etc.), sample fire hazard analysis and test records. 4. Fill in the status of the prototype, the content of the prototype identification and relevant technical parameters on the test record. Test steps: 1. Turn on the power switch of the combustion box, and set the test time and observation time to 30s. 2. Open the combustion test door. Screw the gas switch back“OFF”position, make sure the gas cylinder button is in the“take off”position. Due to the special safety design, if the gas switch is not adjusted to“OFF”position, the gas cylinder will not fit into the furnace body. 3. When placing the gas cylinder, the notch of the gas cylinder valve must be upward. It must be noted that the gas cylinder valve notch is connected to the connector protrusion of the gas pressure sensing safety device of the portable furnace. 4. Press the gas button until“SET”s position. Improperly installed gas cylinders can cause butane gas to leak and emit“sizzle”Voice. When installing the gas cylinder, it must be checked that there is no sound. 5. Press the flame adjustment button on the control panel, the device will open the solenoid valve and fire automatically. If the burner does not catch fire, click the stop button immediately, and the gas flow meter can be adjusted appropriately and press the ignition adjustment button again. There is a duckbill gauge in the attachment, and other measuring tools (such as vernier calipers, etc.) can also be used to adjust the gas flowmeter again to stabilize the flame height at 12±1mm; flame temperature from 100℃±5°C to 700°C±3℃, test time 23.5±1.0s. 6. Press the debugging button, the burner trolley will run to the right limit and stop, adjust the burner to make it 45 degrees from the horizontal plane.°Angle, adjust the burner and the clamp so that the distance between the burner and the bottom of the sample is 8mm or the distance from the side is 5mm, and the upward/downward self-reset switch is turned left or right, and the test sample carrier with the sample clamped on the right is adjusted to the standard position. 7. Wrap a layer of silk paper on a smooth white pine board with a thickness of about 10mm, and place it at 200 mm below the position of the test sample where the needle flame is applied.±5mm. 8. After the flame temperature is reached, start the test switch, observe the test sample, the parts around the test sample and the bottom layer, and record the moment when the test flame is removed until the flame is extinguished, or until the test sample or its nearby parts or test With the bottom layer used, the burning duration (t) of the scorching phenomenon is no longer visible. 9. Press the reset button, the burner trolley will return to the left initial position. Test results: Assessed according to the product standard requirements, if the product standard has no requirements, one of the following requirements is met: 1) The test sample does not produce flame and burning phenomenon, and the packaging paper does not ignite or the white pine board does not carbonize. 2) After the needle flame is removed, the flame or burning duration of the test sample, surrounding parts and the bottom layer is less than 30s, the parts around the test sample and the bottom layer will not continue to burn, the packaging paper will not ignite, and the white pine board will not burn. Not carbonized.
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